Astro Megaship
In Power Rangers in Space, the Rangers didn't initially have individual Zords. Instead, the Astro Megaship, which the Rangers used to travel through space, transformed into their primary Megazord. It could only do this with the addition of the NASADA Space Shuttle/Astro Megashuttle that the Turbo Rangers brought with them from Earth and a black box of Zordon's that Alpha 6 decoded. The Megaship was armed with the Mega Lasers, which could be used to fire on Velocifighters.
The ship had an on-board computer named D.E.C.A. that communicated with the Rangers about the ship's functionality. It spoke with a woman's voice (voiced by Julie Maddalena).
Also the space rangers wouldn't have been able to use their powers without Astro Megaship, since it was the command center that controlled their morphing powers.
Some time before the events of Power Rangers Lost Galaxy, the Astro Megaship was retrofitted into a museum before it was hijacked by Kai Chen, the future Blue Galaxy Ranger, to chase after Kendrix Morgan and Mike and Leo Corbett. It was used as the Rangers' transport throughout the season, and seen in battle once more as the Astro Megazord when the Space Rangers teamed up with the Galaxy Rangers to fight the restored Psycho Pink.
When Terra Venture came under attack by Trakeena's forces and crash landed on a nearby moon, the Rangers used the Astro Megaship in an attempt to distract Trakeena's ship, the Scorpion Stinger, from interfering with the evacuation of Terra Venture. The Rangers, having no other choice, self-destructed the Astro Megaship when it was caught in a pincer by the Scorpion Stinger.
Sometime later, during the episode "Forever Red," a newer Astro Megaship was revealed, having been built on the shipyards of KO-35, and was the transport for eight of the Red Rangers (Leo Corbett and Aurico had joined the group later in the episode) to the moon for their mission to defeat the remnant of the Machine Empire. The Astro Megaship Mark II, as it was called, was effectively a faster version of the original ship. The Mark II was staffed by a robot Alpha 7, who effectively was the personality of Alpha 5 in a body made up of pieces of both Alpha 5 and Alpha 6. However, whether the Mark II had its own version of D.E.C.A. or whether it could have transformed into a new Astro Megazord was not explored further.
The Astro Megaship is also the first command center that becomes a Megazord. This would be repeated in Power Rangers S.P.D. with the Delta Base becoming the Delta Command Megazord. It is also the first traveling command center; this would also be repeated again in Power Rangers Ninja Storm with the Mobile Command Center, Power Rangers Dino Thunder with the Triceramax Command Center Truck, and S.P.D. with the Delta Command Crawler which is transformed from the Delta Base and transforms into the Delta Command Megazord.
Read more about this topic: Zords In Power Rangers In Space