He debuted in Into the Fourth Dimension. He first appeared with the others before disappearing to look for D-Stars. When Starman3 was about to get the 80th D-Star, Starman4 grabbed it instead, and helped the group get the D-Stars. He helped the group go to the Rainbow RainMoon in the Fourth Dimension.
Special "Other" Videos
This was his first appearance outside Into the Fourth Dimension. He appeared at the Star Road when Starman3 gained 5000 subscribers.
When Starman3 actually visited the Fourth Dimension again, SM4 was revealed to have a group called Fourth Dimensional Rangers (or 4DR for short).
He made a cameo during Blooper 40 - Part 9, where he cheered Starman3 on to get up.
He later appeared in Blooper 44, where he and SM3 talked for a while. He had invited YTR to the Fourth Dimension for the anniversary.
He only made a cameo in the form of singing the "Follow the Rainbow Brick Road" song.
Main Article: Fourth Dimensional Rangers
He owns a group similar to Starman3's group. His group is called the Fourth Dimensional Rangers.
It has members similar to the ones in Youtube Rangers. It also functions similarly to YTR.
It is also confirmed that Starman4 has a Star that can be used to travel dimensions, as told in Starman3 visits the Fourth Dimension.
Counterparts and Other Relevant Characters
Mushroom Kingdom/Blooper Land counterpart: Starman3
Star World counterpart: StarWorldMan3
Dimension X counterpart (doppelganger): Ztarman3
Crown Dimension counterpart: Starman5