Uchuu Sentai Kyuranger (2017)

It's the very first Super Sentai series what made many of it's successors possible. If you want to watch the original first season of the Super Sentai series.

It's the 40th sequel of the series from Super Sentai right after Doubutsu Sentai Zyuohger which is the 39th sequel. If you would like to watch the super sentai series chronologically.

It's the 41th sequel of the series from Super Sentai right after Uchuu Sentai Kyuranger which is the 40th sequel. If you would like to watch the super sentai series chronologically.

Wakusaber is a show meant to parody Toei's Super Sentai. So naturally, any sentai would be a good recommendation. However, Kyuranger is the first, and only, sentai to have Space as the motif. And in a similar fashion to how Wakusaber dedicates each episode to show how the members became Wakusabers, Kyuranger adds a new member just about weekly in the first few episodes.