  The standard cosmological model is in the midst of a stress test, thanks to
the tension between supernovae-based measurements of the Hubble constant
$H_{0}$ and inferences of its values from Cosmic Microwave Background (CMB)
anisotropies. Numerous explanations for the present-day cosmic acceleration
require the presence of a new fundamental scalar field, as do Early Dark Energy
(EDE) solutions to the Hubble tension. This raises the possibility that
\textit{multiple} fields cooperatively contribute to the dark energy component
in bursts throughout cosmic time due to distinct initial conditions and
couplings. Here, this Cascading Dark Energy (CDE) scenario is illustrated
through a realization that effectively reduces to a two-field model, with two
epochs in which dark energy is cosmologically significant. The model is
compared to measurements of the CMB, baryon acoustic oscillations, and
observations of Type-Ia supernovae. It is found that this scenario ameliorates
the Hubble tension, improving over purely late-time models of dark energy, and
improves agreement between the related Rock `n' Roll EDE scenario and galaxy
survey measurements of baryon acoustic oscillations.
