Not bad, considering its early Saturday morning time slot.
As the weeks passed, TSSZ News tracked Sonic Boom ratings via TV By The Numbers. Thanks to them, what we've known so far is that the show has consistently ranked #1 in its time period among boys ages 6-11 and 9-14. Recently, however, TV By The Numbers posted cable ratings for Saturday, the day "Eggheads" premiered. Sonic Boom reached the list of top 100 cable shows for adults 18-49 for the entire day... with approximately 998,000 viewers in that age group. This is a promising sign for Sonic Boom, but keep in mind that this number does not include the children's demographic, concerning which no official numbers have been released.
If you haven't had the chance to catch Sonic Boom, don't worry: reruns of the first eight episodes air weekdays at 12:00pm/ET.