Short answers, pulled from the story.
Star Comics was a Marvel Comics imprint launched in July 1984, aimed at child readers. It published adaptations of children's television series, animated shows, and toy lines, alongside a smaller number of original characters.
Marvel created Star Comics to fill a gap left when Gold Key Comics ended its licensed kids' titles in 1983. A prior plan to take over Harvey Comics characters collapsed when Harvey pulled out of the deal on the day the takeover was set to happen, which led Marvel to launch an original children's imprint instead.
The imprint's signature titles were Peter Porker, The Spectacular Spider-Ham and Heathcliff, the latter being the longest-running Star Comics title. The imprint also published two Star Wars animated series adaptations, Droids and Ewoks, and early issues of Muppet Babies, Fraggle Rock, and Care Bears.
Harvey Comics sued Marvel in late 1985 for copyright infringement, claiming Royal Roy was a blatant copy of their character Richie Rich. The title was canceled after six issues as a result of that legal action.
Marvel dissolved the Star Comics imprint at the end of 1987. The last comic with a Star Comics cover date carried a May 1988 date, and the Star Comics Magazine continued through December 1988.
Several original Star Comics characters reappeared in later Marvel publications. Top Dog, Planet Terry, Royal Roy, and Wally Wizard were all featured in titles such as X-Babies and Drax after the Star imprint ended.