I noticed that as well last night. I thought maybe it was a Dish guide error, but multiple online programming guides (TV Passport, TitanTV, and OnTV Tonight) did not have Captain Planet listed. Maybe they were all using the same wrong source, or something was changed on Boomerang's side. But that was surprising. Captain Planet years ago would be on for 1 hour in the morning, 5-6am central time, but since it was removed from the time, yesterday was the first time I have seen it on Boomerang since.
I was just reading online, and Boomerang has had a tradition of doing Captain Planet marathons on Earth Day. Wikipedia says they did it from 2005-2014 but didn't mention anything of doing it this year.
I was a big fan of it years ago when I first finished college in the mid 2000's. I liked the days of Flinstones, Jetsons, Captain Planet, Heathcliff, Richie Rich, Yogi Bear, and Dennis the Menace. A lot of shows that I watched as a kid growing up the 80's and early 90's.
For those who don't already have Boomerang in their Dish programming package, that $40 a year would be cheaper than adding an add-on (or upgrading to a higher Dish package) to get Boomerang through Dish. Heck, Welcome Pack runs about $40 per month. So, if Boomerang was the only channel you ever watched on Dish, the $40 a year would be much cheaper than the cheapest Dish package that includes it. I am just saying, there are situations where a subscription to the app makes sense.